MPCHECKSTYLE-7. Allow Checkstyle plugin to access checks file from a URL.

git-svn-id: https://svn.apache.org/repos/asf/maven/maven-1/plugins/trunk@115033 13f79535-47bb-0310-9956-ffa450edef68

checkstyle/xdocs/properties.xml

@@ -70,6 +70,16 @@
             formats (see <code>maven.checkstyle.format</code>).
           </td>
         </tr>
+        <tr>
+          <td>maven.checkstyle.propertiesURL</td>
+          <td>Yes</td>
+          <td>
+            Specifies the URL of the checkstyle properties that will be
+            used to check the source. Note that you will need to use this
+            property only if you don't want to use any of the predefined
+            formats (see <code>maven.checkstyle.format</code>).
+          </td>
+        </tr>
         <tr>
           <td>maven.checkstyle.header.file</td>
           <td>Yes</td>